# Describe and explain the effect of a magnetic field on a current frame

The magnetic field has a rotating effect on the frame with the current. The rotation of the frame with a current in a magnetic field is explained by the action of the Ampere forces on it. These forces act on both the left and right sides of the frame, but in opposite directions. If the external magnetic field is uniform, then the resultant of all the Ampere forces will be zero, but the moment of all the Ampere forces will not be reflected to zero, which means that the frame will start to rotate (a torque is created, and the frame rotates to a position in which the magnetic vector induction is perpendicular to the plane of the frame) The rotating effect of the magnetic field is taken into account in electric motors – machines that convert electrical energy into mechanical work.

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